html,
body {
  height: 100%;
  background: #f4f4f4;
}
.wraper {
  height: 100%;
  box-sizing: border-box;
  padding-bottom: 50px;
}
.chatBox {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  background: #fff;
  display: flex;
  align-items: center;
  box-sizing: border-box;
  padding: 10px;
}
.chatInput {
  flex: 1;
  height: 100%;
  border: 1px solid #eee;
  border-radius: 5px;
  box-sizing: border-box;
  font-size: 14px;
  color: #333;
  outline: none;
  padding: 5px;
  margin: 0;
}
.chatBtn {
  width: 80px;
  height: 100%;
  outline: none;
  border: 1px solid #eee;
  font-size: 16px;
  color: #fff;
  background: #0069a2;
  margin: 0;
  padding: 0;
  margin-left: 10px;
  border: 0;
  border-radius: 5px;
}